AISI 1340 Steel Flange,

1,We Manufacturing processes are primarily classified into four types: 1:Forging, 2:Casting, 3:Cutting, 4:Rolling. 2,We can manufacture in accordance with these standards. Standards: GB Series (Chinese Standards), JB Series (Machinery Standards), HG Series (Chemical Industry Standards), ASME B16.5 (American Standards), BS4504 (British Standards), DIN (German Standards), and JIS (Japanese Standards). Internationally, there are two primary systems of pipe flange standards: the European system, represented by the German DIN standards (including those of the former Soviet Union), and the American system, represented by the US ANSI pipe flange standards. Other common standards include: the Chinese Ministry of Machinery Industry standards (JB series), the Ministry of Chemical Industry standards (HG series), the Chinese National Standard *GB/T 9112–9124-2010 Steel Pipe Flanges*, as well as US standards (ASME B16.5), British standards (BS4504), German standards (DIN), Japanese standards (JIS), and marine standards (CBM), among others. The nominal pressure ratings for the PN series are designated by "PN" and comprise the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160. The nominal pressure ratings for the Class series are designated by "Class" and comprise the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500. Flange Classification 1. **According to Chemical Industry Standards:** Flanges are classified as follows: Plate Flat Welding Flange (PL), Necked Flat Welding Flange (SO), Necked Butt Welding Flange (WN), Integral Flange (IF), Socket Welding Flange (SW), Threaded Flange (Th), Butt Welding Ring Loose Flange (PJ/SE), Blind Flange (BL), Flat Welding Ring Loose Flange (PJ/PJ), and Lined Blind Flange (BL(s)). 2. **According to Petrochemical (SH) Industry Standards:** Flanges are classified as follows: Threaded Flange (PL), Butt Welding Flange (WN), Flat Welding Flange (SO), Socket Welding Flange (SW), Loose Flange (LJ), and Blind Flange (no specific designation). 3. **According to Machinery (JB) Industry Standards:** Flanges are classified as follows: Integral Flange, Butt Welding Flange, Plate Flat Welding Flange, Butt Welding Ring Plate Loose Flange, Flat Welding Ring Plate Loose Flange, Lap Joint Ring Plate Loose Flange, and Blind Flange. 4. **According to Connection Method/Type:** Flanges are classified as follows: Plate Flat Welding Flange, Necked Flat Welding Flange, Necked Butt Welding Flange, Socket Welding Flange, Threaded Flange, Blind Flange, Necked Butt Welding Ring Loose Flange, Flat Welding Ring Loose Flange, Ring-Type Joint (RTJ) Flange and Blind Flange, Large-Diameter Plate Flange, Large-Diameter High-Neck Flange, Figure-8 Blind Plate, Butt Welding Ring Loose Flange, etc. 5. **According to the Component Being Connected:** Flanges can be classified into Vessel Flanges and Pipe Flanges. 6. **According to Structural Type:** Flanges include Integral Flanges, Threaded Flanges, Flat Welding Flanges, Butt Welding Flanges, Lap Joint (Loose/Swivel) Flanges, and Blind Flanges. A flange—also referred to as a flange plate or rim—is a component used to connect shafts to one another, or, more commonly, to join the ends of pipes. Flanges are also utilized at the inlet and outlet ports of equipment to facilitate connections between two devices—for instance, the flange on a speed reducer. A "flange connection" or "flanged joint" refers to a detachable joint assembly comprising three interconnected elements—a flange, a gasket, and bolts—that together form a sealed structural unit. In the context of piping systems, a "pipe flange" specifically denotes a flange used for plumbing within the installation; when applied to equipment, it refers to the inlet or outlet flange of that specific device. Flanges feature a series of holes through which bolts are inserted to securely fasten the two flanges together, while a gasket placed between the flanges ensures a leak-proof seal. Flanges are broadly categorized into three types: threaded (screw-in) flanges, welded flanges, and clamp-type flanges. Flanges are invariably used in pairs; threaded flanges are suitable for low-pressure piping applications, whereas welded flanges are required for systems operating at pressures exceeding 4 kilograms per square centimeter. A sealing gasket is inserted between the two flange plates, which are then firmly secured using bolts. The thickness of a flange—as well as the specifications of the bolts used to fasten it—vary depending on the specific pressure rating required for the application. When connecting equipment such as water pumps or valves to piping systems, the corresponding connection points on these devices are often manufactured in the shape of a matching flange; this method of attachment is also referred to as a "flange connection." Generally, any connecting component that utilizes bolts to join and seal the perimeters of two flat surfaces—such as the joints in ventilation ducts—is termed a "flange"; such components may collectively be classified as "flange-type parts." However, since such a connection often constitutes merely a *portion* of a larger device—for instance, the interface between a flange and a water pump—it would be inappropriate to classify the entire water pump itself as a "flange-type part." Conversely, smaller components—such as valves—that feature such flanged interfaces may indeed be appropriately categorized as "flange-type parts." -:- For detailed product information, please contact sales. -: AISI 1340 Steel Flange, Product Information -:- For detailed product information, please contact sales. -: AISI 1340 Steel Flange, Synonyms -:- For detailed product information, please contact sales. -:

AISI 1340 Steel, Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI 1340 Medium-Carbon Manganese Alloy Steel** ## **Overview** **AISI 1340** is a versatile and widely utilized medium-carbon manganese alloy steel within the AISI 13xx series. This grade offers an excellent balance of strength, toughness, and wear resistance, positioned between the lower-carbon 1330/1335 and the higher-carbon 1345 grades. Its moderate carbon content combined with substantial manganese provides good hardenability, making it suitable for oil quenching to achieve high strength in moderately sized sections. AISI 1340 is a workhorse material for forged and machined components subjected to high stresses, impact, and abrasion. --- ## **1. Chemical Composition** The composition adheres to the AISI standard, with manganese as the primary alloying element enhancing hardenability beyond plain carbon steels. | Element | Content Range (% by weight) - **AISI 1340** | | :--- | :--- | | **Carbon (C)** | 0.38 - 0.43 | | **Manganese (Mn)** | 1.60 - 1.90 | | **Phosphorus (P)** | 0.035 max | | **Sulfur (S)** | 0.040 max | | **Silicon (Si)** | 0.15 - 0.35 | | **Iron (Fe)** | Balance | **Key Role of Elements:** * **Carbon (0.38-0.43%):** Provides the foundation for hardness and strength. This range is ideal for components requiring high strength with good core toughness after heat treatment. * **Manganese (1.60-1.90%):** Significantly improves hardenability, allowing for deeper and more uniform hardening during oil quenching. It also contributes to strength and wear resistance. * **Silicon:** Primarily a deoxidizer during steelmaking, it also provides solid solution strengthening. --- ## **2. Physical & Mechanical Properties** Properties are highly dependent on heat treatment. The values below are typical for properly quenched and tempered material. ### **A. Physical Properties (Approximate)** * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Elastic Modulus (Young's Modulus):** 200-210 GPa (29,000-30,500 ksi) * **Poisson's Ratio:** 0.29 * **Thermal Conductivity:** ~46.5 W/m·K at 100°C * **Coefficient of Thermal Expansion:** 11.6 × 10⁻⁶/°C (20-100°C) ### **B. Mechanical Properties (After Quenching & Tempering)** | Condition | Tensile Strength | Yield Strength | Elongation (%) | Hardness | Impact Toughness (Charpy V) | | :--- | :--- | :--- | :--- | :--- | :--- | | **Annealed (for machining)** | 620-750 MPa | 415-550 MPa | 20-25 | 187-229 HB | - | | **Quenched & Tempered (Low Temp, ~200°C)** | 1550-1800 MPa | 1300-1500 MPa | 9-12 | 50-54 HRC | 20-30 J | | **Quenched & Tempered (Med Temp, ~400°C)** | 1150-1350 MPa | 1000-1200 MPa | 13-16 | 40-45 HRC | 35-50 J | | **Quenched & Tempered (High Temp, ~600°C)** | 850-1000 MPa | 700-850 MPa | 17-22 | 28-33 HRC | 60-80 J | **Hardenability:** AISI 1340 exhibits **good hardenability**. It can through-harden sections up to approximately **40-50 mm (1.5-2 inches)** in diameter with an oil quench, achieving a predominantly martensitic structure. --- ## **3. International Standards & Equivalent Grades** | Standard / Country | Equivalent Designation | Note | | :--- | :--- | :--- | | **SAE (USA)** | SAE J404, J412, J414 (1340) | Primary standard | | **ASTM (USA)** | ASTM A29/A29M (1340) | Standard for Steel Bars | | **UNS** | G13400 | Unified Numbering System | | **DIN (Germany)** | 40Mn6 (~) | Close compositional equivalent | | **EN (Europe)** | 1.5060 / 36Mn6 - 1.5066 / 40Mn6 | Similar grades under EN 10083-3 | | **JIS (Japan)** | SMn438 (~) | Similar Japanese alloy steel grade | | **GB (China)** | 40Mn2 | Approximate Chinese equivalent | | **Hardenability Variant** | **1340H** | Available with guaranteed hardenability per SAE J1268/ASTM A304 | --- ## **4. Product Applications** AISI 1340 is available as **hot-rolled or cold-drawn bars, forging billets, and wire rod**. It is a premier choice for components that are machined and subsequently heat-treated. ### **Primary Industry Sectors and Components:** * **Automotive & Trucking:** * **Axle Shafts & Drive Shafts** (for medium-duty vehicles) * **Gears, Pinions, and Splined Shafts** * **Crankshafts & Connecting Rods** * **High-Strength Fasteners** (e.g., wheel studs, suspension bolts) * **Steering Components** (pitman arms, tie rods) * **General Manufacturing & Heavy Machinery:** * **Hydraulic Cylinder Rods and Piston Rods** * **Machine Tool Components** (spindles, shafts, collets) * **Drive Trains for Agricultural Equipment** (tractor shafts, combine components) * **Roller and Ball Bearing Races** * **Oil & Gas Industry:** * **Drill Collar Components** * **Valve Stems and Shafts** * **Pump Parts** * **Other Applications:** * **Hand Tools** (wrenches, sockets) * **Forged Parts** requiring a good strength-toughness balance. --- ## **5. Heat Treatment, Machinability & Weldability** ### **Heat Treatment:** * **Annealing:** Heat to 830-850°C (1525-1560°F), slow furnace cool. Produces optimal machinability. * **Normalizing:** Heat to 870-900°C (1600-1650°F), air cool. Refines grain structure. * **Hardening:** **Austenitize at 815-830°C (1500-1525°F)**, soak, then **quench in oil**. Water quenching is possible for maximum hardness in simple shapes but carries a high risk of distortion/cracking. * **Tempering:** **Immediately after quenching**, reheat to 200-600°C (400-1110°F) based on desired hardness/toughness balance. **Double tempering** is often recommended for best stability. ### **Machinability:** * **Rating:** Fair to Good (~65% of B1112 free-machining steel) in the **annealed condition** (~187-229 HB). * **Recommendations:** Use sharp tools with positive rake angles, moderate speeds and feeds, and ample coolant. ### **Weldability:** * **Rating:** **Poor.** The medium-high carbon content makes it prone to cold cracking (hydrogen-induced cracking) in the heat-affected zone (HAZ). * **Essential Precautions:** 1. **Preheating:** **200-300°C (400-570°F)** is mandatory, especially for thicker sections. 2. **Process:** Use **low-hydrogen welding electrodes** (AWS E7018, E11018) or processes like GTAW. 3. **Post-Weld Heat Treatment (PWHT):** **Stress relieving immediately after welding is strongly recommended**, followed by a full re-heat treatment (re-austenitizing and tempering) for critical applications to restore HAZ properties. --- ## **Summary** **AISI 1340** is a robust and cost-effective medium-carbon alloy steel that delivers a superior combination of strength, toughness, and wear resistance compared to plain carbon steels like 1040 or 1045. Its excellent hardenability allows it to be effectively strengthened through oil quenching in a wide range of part sizes. This steel is a **fundamental engineering material** for high-stress dynamic components across automotive, agricultural, and general manufacturing industries. For applications where consistent through-hardening is critical for performance and production reliability, the **AISI 1340H** variant should be specified to guarantee hardenability. While it requires careful welding procedures, its overall performance and versatility make it a cornerstone material for durable mechanical components. -:- For detailed product information, please contact sales. -: AISI 1340 Steel, Specification Dimensions Size： Diameter 20-1000 mm Length <4006 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: AISI 1340 Steel, Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1340 Steel Flange, -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1340 Steel Flange, -:- For detailed product information, please contact sales. -:

Packing of AISI 1340 Steel Flange, -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Flange drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 477 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition